1812420955 has 4 divisors (see below), whose sum is σ = 2174905152. Its totient is φ = 1449936760.

The previous prime is 1812420919. The next prime is 1812421027. The reversal of 1812420955 is 5590242181.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1812420955 - 2¹⁷ = 1812289883 is a prime.

It is a super-2 number, since 2×1812420955² = 6569739436246224050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181242091 + ... + 181242100.

It is an arithmetic number, because the mean of its divisors is an integer number (543726288).

Almost surely, 2^1812420955 is an apocalyptic number.

1812420955 is a deficient number, since it is larger than the sum of its proper divisors (362484197).

1812420955 is an equidigital number, since it uses as much as digits as its factorization.

1812420955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362484196.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 1812420955 is about 42572.5375682493. The cubic root of 1812420955 is about 1219.2320157632.

It can be divided in two parts, 181 and 2420955, that added together give a square (2421136 = 1556²).

The spelling of 1812420955 in words is "one billion, eight hundred twelve million, four hundred twenty thousand, nine hundred fifty-five".